Piston construction



- May 2, W39. A. c. VAN HOOYDONK 9 PISTON CONSTRUCTION Filed April 28,1938 Patented May 2, i939 UNITED STATES. PATENT OFFICE PISTONCONSTRUCTION Adrian C. Van Hooydonk, Buflalo, N. Y., assignor to John E.Smiths Sons Company, Buffalo, N. Y., a corporation of New YorkApplication April 28, 1938, Serial No. 204,791

4 Claims. (01. 309-4) This invention relates to certain new and useandterminates at its upper and lower ends in inful improvements in pistonconstruction of the wardly-converging seats 2|, while the outer typeused in sausage stufiing machines. groove I8 extends above and below thecorre- It has for one of its objects to provide a piston sponding endsof the inner groove and terminates of this character having simple andeflicient at its opposite ends in outwardly-converging 5 packing meansfor effectually preventing leakage seats 22 in the -manner shown inFigure 4, the of air, water or meat past the piston during its angulardisposition of these seats being substanoperative stroke. tially thesame but in opposing diverging relation.

Another object of the invention is the provision The packing means, bypreference, consists of an of simple means for adjustably connecting theinner ring l9 having its upper and lower ends 10 piston-sections formovement toward and from shaped to fit the ends of the companion innereach other and for preventing the escape of air groove I1 and an outerring 20 in concentric, between such sections and about such adjustableabutting relation to said inner ring and having means into the cylinderabove the piston. its upper and lower ends shaped to fit the seats Inthe accompanying drawing: 22 of the outer groove I8, as shown in Figure2. 15

Figure 1 is a sectional side view of a sausage By this construction, acontraction of the piston stuffer equipped with my improved piston.Figsections I5 and I6, during its upward stroke to ure 2 is an enlargedsectional elevation of the imdischarge the sausage from the cylinder,causes proved piston in its cylinder. Figure 3 is a horian outwarddeflection or bilging of the packing zontal section taken on lines 33,Figure 1. ring 20 into sealing engagement with the cylin- 20 Figure 4 isa fragmentary cross section of the pisder which is more or lesscontrolled by the angu-" ton with the packing means removed. lardisposition of the packing seats 22, while the Similar characters ofreference indicate corcompanion inner ring I9 acts as a resilientbackresponding parts throughout the several views. ing to resist inwarddeflection of the outer ring 5 In the stufi'er shown in the drawing, byway 20 and by reason of the angular disposition of 5 of example, Itindicates the customary upright the packing seats 2 I, tends to distendsuch inner cylinder for receiving the sausage or chopped ring radiallyoutward to transmit a like distenmeat and II indicates the piston whichis freely tion to the medial portion of the outer ring, all operable inthe cylinder for ejecting the sausage to the end of making for a firm,seal-proof joint or meat-dough therefrom on its upstroke between thepiston and the cylinder and efiec- 30 through the customary dischargeopenings in the tively prevent leakage of air, water or meat pastcylinder, one of such openings being indicated the same. On the down oridle stroke of the at I2. piston its sections expand or separate toeflfect The lower end of the cylinder is closed and a correspondingcontraction of the packing 5 leading thereto is apipe I3 for admittingthe momeans I9, 20 from sealing engagement with the tive fluid underpressure into the cylinder for cylinder, to thereby allow the freedownward raising the piston to eject the contents ther movement of thepiston in the cylinder. from. After the contents are ejected, the pistonThe piston-sections l5, I6 may be joined torops'by gravity to the bottomof the cylinder. gether by a screw stud 23 rising from the lower 40 Thepperend of the cylinder is provided wit section and passing freelythrough an opening in 40 e cust y filling pe g a suitable closure theupper section, a nut 24 being applied to the l closing and Sealing EOpening during upper end of the stud to clamp the sections tothedlscharge stroke of the plstongether in their properly adjustedposition. A

In its preferred construction the piston comspace 25 is provided betweenth opposing marprises upper and lower spaced sections I5, I6 ginal edgesof the pistomsections which is 45 which are adJustably connected g g ggbridged by the packing ring I9, permitting rela- 33 5 2 i g i i g gggz Ezy gig fi tive movement of the sections toward and from 301 g per p er p0 each other. As shown in Figure 2, the screw stud ing inner and outerconcentric grooves, indicated generally by the numerals I1 and I8, whichjointm 24 1s aliranged wlthm recess 26 m h upper 1y form a single groovefor receiving a compres piston section I5 and a screw plug 21 1s fittedsible packing means I9, 20 of rubber or like therein to form a closuretherefor. To prevent terial to provide a ]eak pro f joint or seal b theescape of air from between the p1ston-sectween the piston and thecylinder. The inner tiOnS and ug the screw P joint to t groove I1 is ofless height than the outer groove cylinder, a sealing gasket 28 isprovided between 5 the plunger and its junction with the marginal toprim of the recess.

In order to prevent the piston-sections and compressible packingaccidentally being disturbed after being adjusted properly to thecylinder wall, and which disturbance may result from loosening of thestud-engaging nut 24, a cotter or like pin 29 is provided for lockingthe nut in its adjusted set position on the stud 23.

I claim as my invention:

1. A piston of the character described, comprising upper and lowersections having mating inner and outer concentric grooves in theadjoining portions of their peripheries, the end seats of the outergroove converging outwardly and the companion seats of the inner grooveconverging inwardly, and compressible packing members disposed inconcentric abutting relation in said grooves and engaging the respectiveend seats thereof.

2. A piston of the character described, comprising upper and lowersections having mating inner and outer concentric grooves in theadjoining portions of their peripheries, the inner groove being counterto and of less heighth than the outer groove and th' respective endseats thereof being disposed in opposing angular relation, andcompressible packing members disposed in concentric abutting relation insaid grooves.

3. A piston of the character described, comprising upper and lowersections including means for adjusting them .toward and from each otherand having a peripheral groove between the adjoining portions thereof,said groove having an inner portion terminating at its ends ininwardly-converging seats and a concentric outer portion terminating atits ends in outwardly-converging seats extending above and below thoseof the companion seats, and compressible packing means disposed in saidgroove and having its end shaped to conform with said seats,respectively.

4. A piston of the character described, comprising upper and lowersections including means for adjusting them toward and from each otherand having a peripheral groove between the adjoining portions thereof,said groove having an inner portion terminating at its ends ininwardly-converging seats and a concentric outer portion terminating atits ends in outwardly-con-

